HO Union Pacific Big Boy curve radius

[Anonymous]

What is the best curve radius a HO Union Pacific Big Boy will run on ?

[lupo]

the bigger curve the better, the smallest curve I tried was on the 3' x 4' layout of my son, It looked very silly, the boiler and firebox sticking out a lot and a ultra wide gap between engine and tender but it came through, but I think the smallest curve looking acceptable is 20" plus .I only run several Rivarossi 4-8-8-4 's so I don't know how the curve handling is for e.g. TRIX or Marklin. BTW: the gap between engine and tender is adjustable on the Rivarossi models making it easier to handle small curves or making it look more realistic.

[Anonymous]

If you want it to look good, over 30", and ideally 36-42" curves.